Vent valve of a wastewater drainage pipe



FIG. 1 is a perspective view of a vent valve of a wastewater drainage pipe showing my new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a left side elevational view thereof;

FIG. 5 is a right side elevational view thereof;

FIG. 6 is a top plan view thereof;

FIG. 7 is a bottom plan view thereof;

FIG. 8 is an enlarged detail view of area 8 circumscribed within FIG. 1 ; and,

FIG. 9 is a cross-sectional view in the direction of line 9-9 in FIG. 6 .

The evenly spaced broken lines depict portions of the vent valve of a wastewater drainage pipe that form no part of the claimed design. The dash-dot-dash broken lines shown in FIGS. 1 and 8 denote the boundaries of the areas of detail and form no part of the claimed design. 

CLAIM The ornamental design for a vent valve of a wastewater drainage pipe, as shown and described. 